package com.xuecheng.media.service.jobhandler;

import com.xuecheng.media.model.po.MediaProcess;
import com.xuecheng.media.service.MediaFileProcessService;
import com.xuecheng.media.service.MediaFileService;
import com.xuecheng.utils.Mp4VideoUtil;
import com.xuecheng.utils.VideoUtil;
import com.xxl.job.core.context.XxlJobHelper;
import com.xxl.job.core.handler.annotation.XxlJob;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

@Component
@Slf4j
public class VideoTask {
    
    @Resource
    private MediaFileProcessService mediaFileProcessService;
    
    @Resource
    private MediaFileService mediaFileService;

    //ffmpeg的路径
    @Value("${videoprocess.ffmpegpath}")
    private String ffmpegpath;
    
    
    

    /**
     * 视频处理任务
     */
    @XxlJob("videoJobHandler")
    public void shardingJobHandler() throws Exception {

        // 分片参数
        int shardIndex = XxlJobHelper.getShardIndex();
        int shardTotal = XxlJobHelper.getShardTotal();
        
        // 确定cpu和核心数
        int processors = Runtime.getRuntime().availableProcessors();

        // 查询待处理任务
        List<MediaProcess> mediaProcessList = mediaFileProcessService.getMediaProcessList(shardIndex, shardTotal, processors);
        // 任务数量
        int size = mediaProcessList.size();
        log.debug("取到视频任务处理数:{}", size);
        if (size <= 0){
            return;
        }
        // 创建一个线程池
        ExecutorService executorService = Executors.newFixedThreadPool(size);
        // 使用计数器
        CountDownLatch countDownLatch = new CountDownLatch(size);
        mediaProcessList.forEach(mediaProcess -> {
            // 将任务加入线程池
            executorService.execute(() -> {
                try {
                    // 任务执行
                    // 任务id
                    Long taskId = mediaProcess.getId();
                    // 文件Id就是md5
                    String fileId = mediaProcess.getFileId();
                    // 开启任务
                    boolean task = mediaFileProcessService.startTask(taskId);
                    if (!task){
                        log.debug("抢占任务失败,任务id:{}", taskId);
                        return;
                    }

                    // 桶
                    String bucket = mediaProcess.getBucket();
                    String objectName = mediaProcess.getFilePath();
                    // 下载minio视频到本地
                    File file = mediaFileService.downloadFileFromMinIO(bucket, objectName);
                    if (file == null){
                        log.debug("下载视频出错,任务id:{}, bucket:{},objectName:{}", taskId, bucket, objectName);
                        // 保存任务处理失败的结果
                        mediaFileProcessService.saveProcessFinishStatus(taskId, "3", fileId, null, "下载视频到本地失败");
                        return;
                    }



                    // 执行视频转码
                    //源avi视频的路径
                    String video_path = file.getAbsolutePath();
                    //转换后mp4文件的名称
                    String mp4_name = fileId + ".mp4";
                    // 转换后mp4文件的路径
                    // 先创建一个临时文件，作为转换后的文件
                    File mp4File = null;
                    try {
                        mp4File = File.createTempFile("minio", ".mp4");
                    } catch (IOException e) {
                        log.debug("创建临时文件异常,{}", e.getMessage());
                        mediaFileProcessService.saveProcessFinishStatus(taskId, "3", fileId, null, "创建临时文件异常");
                        return;
                    }
                    String mp4_path = mp4File.getAbsolutePath();
                    //创建工具类对象
                    Mp4VideoUtil videoUtil = new Mp4VideoUtil(ffmpegpath,video_path,mp4_name,mp4_path);
                    //开始视频转换，成功将返回success，失败返回失败原因
                    String result = videoUtil.generateMp4();
                    if (!result.equals("success")){
                        log.debug("视频转码失败,原因:{},bucket:{},objectName:{}", result, bucket, objectName);
                        mediaFileProcessService.saveProcessFinishStatus(taskId, "3", fileId, null, result);
                        return;
                    }
                    // 上传视频文件到minio
                    boolean b = mediaFileService.addMediaFilesToMinIO(mp4File.getAbsolutePath(), "video/mp4", bucket, objectName);
                    if (!b){
                        log.debug("上传mp4到minio失败,taskId:{}", taskId);
                        mediaFileProcessService.saveProcessFinishStatus(taskId, "3", fileId, null, result);
                        return;
                    }
                    // mp4文件的url
                    String url = getFilePathByMd5(fileId, ".mp4");

                    // 更新任务状态为成功
                    mediaFileProcessService.saveProcessFinishStatus(taskId, "2", fileId, url, null);

                    // 保存任务处理结果
                } finally {
                    countDownLatch.countDown();
                }
            });
        });
        
        // 阻塞，指定最大限制的等待时间，阻塞最多等待一定的时间后就解除阻塞
        countDownLatch.await(30, TimeUnit.MINUTES);

        
    }

    /**
     * 得到合并后的文件的地址
     * @param fileMd5 文件id即md5值
     * @param fileExt 文件扩展名
     * @return
     */
    private String getFilePathByMd5(String fileMd5,String fileExt){
        return fileMd5.substring(0,1) + "/" + fileMd5.substring(1,2) + "/" + fileMd5 + "/" +fileMd5 +fileExt;
    }

}
